Stop mechanism for looms



H. W. YOUNGQUIST.

STOP MECHANISM FOR LO OMS. APPLICATION FILED suL'v 2. 1921.

1,398,532. Patented Nov, 29, 1921.

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STOP MECHANISM FOR LOOMS.

APPLICATION man JULY 2, 1921.

1,398,532; Patented Nov. 29, 1921.

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M MKJMM UNITED 'ST'E'S 'ATNT FFICE.

HENRY W. YOUNGQUIST, OF MANCHESTER, NEW HAMPSHZBE, ASSIGNOR TO DRAPERCORPORATION, OF HOEEDALE, MASSACHUSETTS, A CORYOB-ATION OF MAINE.

sror MECHANISM FOR LOOMS.

To all whom it may concern:

Be it known that I, HENRY WV. YOUNG- UIsT, a citizen of the UnitedStates, and resident of Manchester, county of Hillsborough, State of NewHampshire, have invented an Improvement in Stop Mechanism for Looms, ofwhich the following description, in connection with the accompanyingdrawing, is a specification, lik characters on the drawing representinglike parts.

This invention relates to improvements in stop mechanisms for looms andthe principal object thereof is to provide means operable by an abnormalvariation in the tension of the warps passing over the whip roll toeffect a stoppage of the loom.

In usual loom constructions warp stop mechanisms are provided whichcomprise a series of detectors each of which is suspended upon' a warp,all of said detectors being located above the reciprocating feelerwhich, when arrested by the dropping or letting down of a detector, willinitiate the action of mechanism for effecting the stoppage of the loom.Thus the usual warp stop mechanism provides for a stoppage of the loomupon the breakage of a warp or if the tension upon the warp becomes solow as to permit one or more of the detectors to engage and arrest thereciprocating feeler. It is found that in weaving certain classes ofgoods an abnormally high tension upon the warp is apt to cause a defectin 'the weaving, such asa thin place, and the object of the presentinvention is to provide means, operable by, an abnormal variation in thetension, usually an excessive amount of tension, to cause a stoppage ofthe loom.

More specifically the invention comprises means operable by an abnormalmovement of the whip roll, caused by a variation in the tension of thewarp, to initiate the action of the usual warp stop motion of the loomto effect a stoppage of the loom.

In the present embodiment of the invention the action of the stop motionis initiated by a latch which is controlled by the movement of the whiproll and upon excessive movement of the latter is caused or' permittedto drop into the path of the reciproeating feeler of a usual warp stopmotion.

A preferred embodiment of the invention is illustrated in theaccompanying drawings as applied to the well known NorthropSpecification of Letters Patent.

. Patented Nov. 29, 1921. 1921. Serial no. 482,036.

Fig; 3 is a detail plan view of thesame, I

Fig. 4 is a detail view in perspective of one of the bracket arms whichsupport the shaft uponwhich the latch is mounted,

showing the cam surfaces carried by said bracket; and, v s

Fig. 5 is aperspective view ofthe shaft operating arm having camsadaptedto cooperate with those upon the bracket.

The loom illustrated in the accompanying drawing is of a usual typehaving loom sides 1, the usual lay 2 and means for actuating the same, awarp beam 3 from which the warp passes over a whip roll 4 across theusual leash rods 5 through harnesses '6 and thence through the reed 7 onthe layto the fell of the web of'cloth being woven. The

loom also comprises a usual type of warp stopmechanism in which twoparallel series of detector'bars 8 and 9 are supported upon the warpsbetween the leash rods 5'. The detectors 8 and 9 are guided respectivelyby detector bars 10 and 11 and are adapted, when released by thebreakage or undue slackness of the warp, to drop into the path of thefeeler 12 between said feeler and the stop plate 13 or 14, therebyarresting the movement of the feeler and causing the initiation of theaction of means for effecting the stoppage of the loom; Any suitablemeans may be utilized in so far asthe present invention is concerned. Inthe particular mechanism which is'illustrated herein the feeler 12 iscarried by a rock shaft 15 havinv arms which are connected by rods 16and 1 to actuating arms 18 and 19 which are mounted upon a rock shaft 20carried by a boss or extension 21 of a link 22 which I is provided witha hook-shaped end 23 embracing the cam shaft 24. The actuator arms 18and 19 are oscillated by a cam follower 25 engaging the cam 26 on saidrock shaft. Tappet arms 27 and 28 are resiliently connectedrespectively-to the actuating arms 18 and 19 and are normally oscillatedby the cam follower 25 out of the path of tappets 29 and 30 carried bythe cam shaft.

In the normal operation of the loom the feeler is oscillated back andforth beneath the detector bars. When, however, one or more of thedetector bars is released by the breaking or sagging of the warp anddrops into the path of the feeler the movement of the feeler is arrestedthereby causing one of the tappet arms 2 7 or 28 to be held in the pathof the tappet 29 or 30 so that the rotation of the cam shaft 24 causesthe tappets 29 or 30, upon engagement with the tappet arms 27 or 28, tomove the link 22 endwise.

The opposite end of the link 22 is connected to the lower end of ashipper actuating lever 31 which is pivotally mounted upon a stud 32carried by the loom frame;

and is provided with a cam slot 33 engaging a shipper lever 34. hen theshipper actuating lever 31, therefore, is oscillated by the end-wisemovement of the link 22 it throws the shipper out of engagement with itsusual retaining slot and causes the stoppage of the loom in the mannerwell known to those skilled in the art.

The 'mechanism thus described may be and is of the type disclosed inPatent No. 673,824, Stimpson, May 7, 1901.

In the present invention means are provided for arresting thereciprocation of the feeler 12 when the tension upon the warp is variedbeyond a predetermined amount. The means for thus arresting thereciprocation of the feeler may be actuated either by too great atension upon the warp or too slack a tension upon the warp as will bereadily understood. The means illustrated herein, however, are adaptedto be actuated upon an excessive tension upon the warp by an abnormalmovement of the whip roll caused by said excessive tension.

In the present construction the shaft 35 of the whip roll 4 is seated injournals 36 in arms 37 which are rigidly secured to a rock shaft 38journaled in suitable bearings in brackets 39 carried by the loom side.1m arm 40 also fixedly secured to the rock shaft 38 is pivotallyconnected at its free end to a. rod 41 slidably mounted in a bearing ina bracket carried by the loom side (not shown). A spring 42 isinterposed between said bracket and a collar 43 upon the rod 41 and actsnormally to cause said whip roll to exert a tension upon the warppassing from the, warp beam over it to the shed forming mechanism of theloom.

7 It will thus be obvious that the whip roll will move through an areabout the axis of the rock shaft 38 as the tension upon the warp passingover it varies. This movement of the whip roll under the varying tensionof the warp is utilized in the present invention to actuate means forarresting the feeler of the warp stop motion and thus causing a stoppageof the loom when-an abnormal tension is placed upon the warp.

' The preferred mechanism for thus arresting the feeler which isillustrated in the accompanying drawing comprises a latch 43 having ahook-shaped end 44 normally located above the path of the reciprocatingfeeler 12. The latch 43 desirably is pivotal ly mounted upon a shaft 45which is slida-bly mounted in ournals 46 and 47 of a bracket 48 carriedby the loom side. The latch 43 desirably is engaged on one side by africtional washer 49 abutting against a non-rotatable washer 5Oadjustably secured upon the end of said shaft by nuts 51' and is engagedupon the opposite side by a frictional washer 52 which is seated againstthe outer end of the bearing 46 for said shaft. The frictional Washer 49is forced into engagement with the latch 43 by a helical spring 53mounted upon the shaft 45 and abutting at one end against theopposite'side of the bearing 46 and at its other end against anactuating arm 54 which is, rigidly secured to the shaft 45 by a setscrew 55. By reason of this construction the latch may be held manydesired position so long as the frictional clamping means are forcedinto engagement with it by the action of the spring 52.

Any suitable means may be providedfor releasing the latch upon anabnormal variation of the tension of the warp. In the constructionillustrated in the drawings the actuating arm 54 is provided withpreferably a plurality of cams 56 whichengage cooperating cam surfaces57 upon the bracket- 47 in which the shaft 45 is journaledi The cams 56and 57 are so arranged that an oscillatory movement of the actuating arm54 will cause a longitudinal movement of the shaft, thereby releasingthe engagement of said frictional means with the latch 43 so that thelatter will be released and free to drop. V

The actuating arm 54 is connected to a rod 58 which is slidably mountedin a boss 59 on the bracket 48 and its free end lies in the path of anadjustable abutment 60 which is carried by an arm 61 fixedly secured tothe rock shaft 38.

As illustrated'herein the rock shaft arm 61 is provided with asemi-circular portion 62' which partially embraces the rock shaft and acomplementary semi-circular member 63 which are clamped upon the rockshaft by bolts 64. 1

Any suitable means may be provided for adjusting the abutment 60. Asillustrated, the abutment 60 comprises the head of a screw 65 which isadjustably seated'in the arm 61 and is adapted to be held in adjustedpositions by a lock nut 66 abutting against said arm.

In the operation of the device the Whip roll 4 will be oscillated moreor less under variations of tension upon the warp which passes over it.lVhen an excessive tension is imposed upon the warp the whip roll willbe forced downwardly thereby rocking the shaft 38 and causing the arm 61to force the abutment 60 into engagement with the end of the rod 58.This will move the rod 58 endwise and thereby rock the actuator arm 54,thus causing the cams 56 and 57 to force the rock shaft endwise. Thisendwise movement of the rock shaft releases the engagement between thefrictional washer 49 and the latch 43 and permits the hooked end of thelatter to drop into the path of the feeler 12, thereby arresting itsmovement and causing an initiation of the action of the warp stopmechanism to efiect a stoppage of the loom,

It will be understood that the particular embodiment of the inventiondisclosed herein is of an illustrative character and is not restrictiveand that various changes may be made in construction and arrangement ofparts within the meaning and scope of the following claims which areintended and designed to cover any form of mechanism operable by anabnormal movement of the whip roll caused by excessive variations intension upon the warp to effect the stoppage of the loom.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is:

1. A loom comprising a whip roll, a warp stop motion operable upondetection of a warp fault to effect a stoppage of the loom and areldasably supported member operable when released by an abnormalmovement of the whip roll, caused by a change in the tension of thewarp, to initiate the action of said stop motion.

2. A loom comprising a yieldable whip roll, a warp stop motion having aseries of detectors, a reciprocating feeler located in proximity to saiddetectors and adapted, when engaged by a detector, to initiate theaction of said stop motion, a releasable member normally supported outof the path of said feeler and means operable by an abnormal yieldingmovement of the whip roll, caused by an excessive tension upon the warpto release said member thus causing the same to arrest said feeler andthereby initiate the action of said stop motion.

3. A loom comprising a yieldable whip roll, a warp stop motioncomprising a series of detectors, a reciprocating feeler located inproximity to said detectors and adapted, when engaged by a detector, toinitiate the action of said stop motion, a latch, means normallysupporting said latch adjacent to and out of the path of the feeler andmeans operable by an abnormal yielding movement of said whip roll,caused by an excessive tension upon the warp, to cause said latch toengage and arrest said feeler and thereby initiate the action of saidstop motion.

4. A loom comprising a yieldable Whiproll and a warp stop motion havinga series of detectors, areciprocating feeler located in proximity tosaid detectors and adapted, when engaged by a detector, to initiate theaction of said stop motion, a latch, frictional means normallysupporting said latch adjacent to but out of the path of said feeler andmeans operable by an abnormal yielding movement of said whip roll,caused by an excessive tension upon the warp, to release said frictionalmeans and thereby permit said latch to drop into the path of said feelerand thereby initiate the action of said stop motion.

5. A loom comprising a warp stop motion having a series of detectors anda reciprocating feeler located below said detectors adapted to initiatethe action of said stop motion when engaged and arrested by a' detector,a pivotally mounted latch located above and in proximity to said feeler,frictional means supporting said latch, a yieldable whip roll and meansoperable by an ab: normal yielding movement of said whip roll, resultingfrom an excessive tension upon the warp, to release said frictionalmeans thereby permitting said latch to engage andv arrest said feeler,thus initiating the action of the stop motion.

6. A loom comprising a warp stop motion havin series of detectors, areciproeating feeler located below said detectors and adapted toinitiate the action ofsaidstop motion when engaged and arrested by adetector, a slidably, mounted latch-supporting shaft, a latch pivotallymounted upon said shaft and located above and in proximity to saidfeeler, frictional means acting to retain said latch from rotation uponsaid shaft and means operable by an abnormal tension upon said warp tomove said shaft endwise and thereby release said frictional retainingmeans, thus permitting said latch to drop into the path of said feelerand by arresting the latter to initiate the action of said stop motion.

7. A loom comprising a warp stop motion having a series of detectors anda reciprocating feeler located below said detectors and adapted toinitiate the action of said stop motion when engaged and arrested by adetector, a slidably mounted latch supporting shaft, an actuating armhaving a cam operable to move said latch supporting shaft endwise, alatch pivotally mounted on said shaft and located above and in proximityto said feeler, frictional means acting to retain said latch fromrotation onsaid shaft, a yieldably mounted whip roll and means operableby an abnormal tension upon said Warp to actuate said cam actuating armand thereby to move said shaft end *ise and release said frictionalretaining means, thus permitting the latch to drop into the path of thefeeler and by arresting the latter to initiate the action of the stopmotion.

8. A loom comprising a: Warp stop motion having a series of detectorsand a reciprocating feeler located below said detectors and adapted toinitiate the action of said stop motion when engaged and arrested by adetector, a slidably mounted latch supporting shaft, an actuating armhaving a cam operable to move said latch supporting shaft endwise, alatch pivotally mounted on said shaft and located above and in proximityto said feeler, frictional means acting to retain said latch fromrotation on said shaft, a yieldably mounted whip roll and means operableby an abnormal tension upon said warp to actuate said cam actuating armand thereby to move said shaft endwise and release said frictionalretaining means, thus permitting the latch to drop into the path of thefeeler and by arresting the latter to initiate the action of the stopmotion and adjustable means for regulating the extent of movement ofsaid Whip roll required to actuate said cam arm.

9. A loom comprising a warp stop motion having a series of detectors anda reciprocating feeler located below said detectors and adapted toinitiate the action of said stop motion when engaged and arrested by adetector, a slidably mounted latch supporting shaft, an actuating armhaving a camoperable to move said latch supporting shaft endwise, alatch pivotally mounted on said shaft and located above and in proximityto said feeler, frictional means acting to retain said latch fromrotation on said shaft, a whip roll, a rock shaft having an armsupporting said whip roll, means acting upon said rock shaft toyieldably support said whip roll, a rock shaft arm and means operable bythe movement of said rock shaft arm when the whip roll is subjected toexcessive tension upon the Warp to actuate said cam actuating arm andthereby to release said latch thus permitting the latch to drop into thepath of said feeler and by arresting the latter to initiate the actionof said stop motion. 7

10. A loom comprising a warp stop motion having a series ofdetectors anda reciprocating feeler located below said detectors and adapted toinitiate the action of said stop motion when engaged and arrested by adetector, a slidably mounted latch supporting shaft, an actuating armhaving a cam operable to move said latch supporting shaft endwise, alatch pivotally mounted on said shaft and located above and in proximityto said feeler, frictional means acting to retain said latch fromrotation on said shaft, a whip roll, a rock shaft having an armsupporting said Whip roll, means acting upon said rock shaft toyieldably support said whip roll, a rock shaft arm, an abutmentadjustably secured to said latch actuating arm, a slidably mounted rodconnected to said cam arm adapted to be engaged by said abutment uponthe movement of said whip roll caused by excessive tension upon the warpand operable thereby to cause said cam to move the latch shaft endwisethereby releasing said latch and permitting it to drop into the path ofsaid feeler and by arresting the latter to initiate the action of saidstop motion.

In testimony whereof, I have signed my name to this specification.

HENRY W. YOUNGQUIST'.

